1. Forestiere Underground Gardens

From 1906 to 1946, Baldasare Forestiere created an expansive subterranean arboretum with trees from his native Sicily and around the world, digging some 10,000 square feet of bedrooms, skylights, living rooms, a kitchen, a chapel and even his own underground fishpond. Today, the Forestiere Underground Gardens are open to the public. Mr. Forestiere's great-nephew, Andre, lives on the site, giving tours for $10 at noon and 2 p.m., from Wednesday to Sunday, Memorial Day to Labor Day.

Website: Visit the Forestiere Underground Gardens website »

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